LineEdit.qml Example File

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 import Qt 4.7

 Rectangle {
     property alias font: input.font
     property string text: ""
     signal textChanged(string text)

     id: lineEdit
     height: input.height + 6
     color: "transparent"

     TextInput {
         id: input
         anchors.left: parent.left
         anchors.leftMargin: 3
         anchors.top: parent.top
         anchors.topMargin: 3
         anchors.bottom: parent.bottom
         anchors.bottomMargin: 3
         color: "white"

         text: lineEdit.text
     }

     MouseArea {
         anchors.fill: parent
         onClicked: input.focus = true
     }

     states: [
         State {
             when: input.cursorVisible
             PropertyChanges { target: lineEdit; color: "white" }
             PropertyChanges { target: input; color: "black" }
         },
         State {
             when: text == ""
             PropertyChanges { target: lineEdit; border.color: "grey" }
         }
     ]

     Keys.onReturnPressed: {
         lineEdit.textChanged(input.text)
         lineEdit.focus = true
     }
     Keys.onEnterPressed: {
         lineEdit.textChanged(input.text)
         lineEdit.focus = true
     }
     Keys.onEscapePressed: {
         input.text = text
         lineEdit.focus = true
     }
 }